Process of hardening tantalum.



UNITED STATES: PATENT OFFICE.

WERNER VON BOLTON, 0F cRARLoTq BuRc, GE MANY, ASSIGNOR T0 SIEMENS & HA'LSKE'A; G., OF BERLIN, GERMANY, A CORPORATION or GERMANY.

PROCESS OF HARDENING TANTALUH.

Specification of Letters Patent.

Patented June 22, 1909.

To all whom it may concern: Be it known that I, WERN R VON BOLTON, a subject of the Czar of Russia, and residing at Charlottenburg, near Berlin, Germany, have invented a certain new and useful Process for Hardening Tantalum, of which the following is a specification.

1 The subject-matter of the present invention is a process for hardening tantalum.

In accordance with the invention, silicium is employed" as hardening agent. It has been found that siliciuni has the best hardenlng action when it is employed in quantities between 1 per cent. and 10 er cent. of the ened, because'the hardening action of silici um increases considerably when'the addition is increased above 1 per cent,1without the'other good properties of the metal, par.- ticularly its ductility, being im aired to any extent, worth men'tloning.

is to be har- 1th additions of 2 per cent. to 3 'per cent. of silicium, for ex-; A

ample, a material having reat ductility and considerable hardness is o tained. As cow pared'with an addition of 3 lper cent. an addition of 5 er cent. only slig tly increases the hardness, ut the ductility is diminished.

WhatI claim as m invention and desire to secure by Letters atent is:-

1. The herein described process for hardening tantalum, which consists in adding to tantalum less than 10 per cent. and more. than 1 per cent. of'silicium.

2. The herein described process for hardening tantalum, which consists in adding to tantalum 3 per cent. of silicium.

In testimony whereof I have signed my name tothis specification in the'presence of two witnesses.

WERNER VON BOLTON.

Witnesses WOLDEMAR HAUPT, HENRY HABPER. 

